弹性波

The result for an aluminum sphere with gaussian pulse incident wave was compared to the theor y value obtained by inverse Fourier transform from the product of Rayleigh serie s with incident wave in the frequency domain, which shows a good agreement.

计算了高斯形脉冲入射下弹性铝球的无量纲反向散射声压，并和由频域的Rayleigh 简正级数解与入射波的频谱的乘积作反变换得到的精确解做了比较，两者趋势基本一致。

Except the something fortify, the complication of disturb in the dispersion of attenuation data are also graveness, so the evolvement of this area also becomes lentitude.

由于除介质粘弹性影响外，其它的干扰因素引起地表波的散射问题也很严重，使得这个领域的进展相对缓慢。

Sound is a mechanical disturbance of a wave nature that propagates through any elastic medium at a speed characteristic of that medium.

声音是一种自然波的机械振动，通过弹性介质传播，速度取决于由该介质的特性。

So, rubber's viscoelastic characters are researched by the characteristic nomography method in this article, when the stress wave transmits in rubber. And we get the stress'arithmetic solution and strain's arithmetic solution of any place of rubber parts at any time under the action of impact load.

本文又通过特征线解法，分析了橡胶在应力波传播过程中的粘弹性特性，得出了在冲击载荷作用下，橡胶部件的任意部位在任意时刻下的应力、应变数值解法。

In this paper, the analytical expressions of seismic input for homogeneous elastic half-space are first derived in oblique incidence of plane SV-wave, and then a finite element model for a real hydropower cavern group composed of main powerhouse- transformer chamber- tailrace surge tank cavern is created. Characteristics of seismic responses such as displacement, acceleration and stress are studied in detail at different incidence angles and some results are compared with those given by the literature.

本文首先推导了平面SV波斜入射下均质弹性半无限空间的地震动输入表达式，然后建立了某水电站主厂房室-主变室-尾水调压室等构成的地下洞室群有限元模型，详细研究了不同入射角度下各洞室的位移、加速度、动应力等地震反应特点，并与文献进行了对比。

Utilizing the polar angle transform, the expressions of the displacements, stresses and pore pressures of saturated soil and those of the liner in the mapping plane can be obtained.

在此基础上，将原像平面中任意形状的衬砌内外边界处的边界条件代入到映像平面中圆环势函数的关系式中，从而求出饱和土中衬砌介质在弹性稳态体波作用下产生的动态响应。

The limber PVB films in laminated glass have the isolated effect on sound waves, the rebarbative noise is extremely effectively reduced.

夹层玻璃中的富有弹性的 PVB 膜片对声压波有着阻滞作用，极为有效地降低了令人讨厌的噪声传导。

Firstly, based on the Duhamel integral and dynamic reciprocity theorem, the generalized Duhamel integral expression is written to a point in the half infinity space under moving load. Secondly, the train load is considered as a series of centralized loads with fixed distance. The dynamic response expression of a point in frequency domain and frequencywavenumber domain are derived out through the Floquet transform and Fourier transform under a moving load, and then the dynamic response of a point is gotten ...

以Duhamel积分为基础，首先应用动力互等定理，得到了移动荷载作用下，半无限大弹性连续介质空间上任意点的动力响应的广义Duhamel积分表达式；然后将列车荷载简化考虑为一系列具有一定间距的集中荷载，采用Floquet变换、Fourier变换等方法，得到了一个集中移动荷载作用下任意拾振点ξ的动力响应在频域和频率波数域内的表达式，进而由叠加原理得到列车荷载作用下的动力响应解；最后，通过算例说明该算法的适用性。

Phase Ⅲ was the dicrotic phase, i.e.,the area of the first loop expanding from the coordinate axis Y rightwards, which reflected the elasticity of brain arterial blood vessel.

相：为重搏波相，即从Y轴向右侧形成的一个小环所包含的区域，该面积大小反映脑动脉血管弹性。

When solid deformed,two wave, compress and shear, are set off in medium.

这两种波在介质中传播时的速度不同，这决定于介质的弹性模型和密度。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。